[转]自定义SqlMembershipProvider方法

asp 2.0自带了许多方法，很多东西都给我们封装好了，但是这样就导致了我们自定义的空间越来越小。忙碌了两个星期，一直想重写System.Web.Security.SqlMembershipProvider，但是没有找到方法，昨天在asp.net这个晚上上找到了解决方法，真是很兴奋。

打下可以参考一下http://forums.asp.net/p/1042049/1458049.aspx#1458049，我的大部分内容是按照里面的方法来写的。然后将中途遇到的问题做一部分解释。

步骤一：
首先下载一个ProviderToolkitSamples，下载链接如下：

http://msdn.microsoft.com/en-us/library/aa478948.aspx。

因为我们要重写SqlMembershipProvider，好多要用到很多.net 2.0底层的方法，这些方法是首先的，就是我们不能直接使用，比如我们要在类的前面定义：using System.Web.SR就会报错，错误如下：'System.Web.SR' is inaccessible due to its protection level。既然我们要重写SqlMembershipProvider，那么我们就要提供这个类中所使用的所有方法。

步骤二：
安装ProviderToolkitSamples，在C:\Program Files\ASP.NET Provider Toolkit SQL Samples目录下找到下面的四个类，分别是：

SecUtil.cs，SqlConnectionHelper.cs，SQLMembershipProvider.cs，SR.cs。将他们拷贝打网站项目的app_code文件夹下面。

因为原来已经有了.vb的程序集，我们这个时候如果将.cs文件放在同一个文件夹下会编译错误，解决方法参考我前面的那一片博文App_Code目录中存放不同语言的类文件导致错误的解决方案。

还有就是将SQLMembershipProvider.cs改名为MySQLMembershipProvider.cs，并且在类定义做如下修改

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public class MySQLMembershipProvider : System.Web.Security.MembershipProvider
{
/
}
public class MySQLMembershipProvider : System.Web.Security.MembershipProvider
{
/
}

步骤三：
重新定义一个比较方便的命名空间，然后对web.config做一些修改，我的修改如下：

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<add name="MySQLMembershipProvider"
      type="MyProviders.MySQLMembershipProvider"
      connectionStringName="SiteSqlServer"
      enablePasswordRetrieval="false"
      enablePasswordReset="true"
      requiresQuestionAndAnswer="false"
      minRequiredPasswordLength="3"
      minRequiredNonalphanumericCharacters="0"
      requiresUniqueEmail="false"
      passwordFormat="Hashed"
      applicationName="DotNetNuke"
      description="使用MVPHacksMembershipProvider"/>
<add name="MySQLMembershipProvider"
        type="MyProviders.MySQLMembershipProvider"
        connectionStringName="SiteSqlServer"
        enablePasswordRetrieval="false"
        enablePasswordReset="true"
        requiresQuestionAndAnswer="false"
        minRequiredPasswordLength="3"
        minRequiredNonalphanumericCharacters="0"
        requiresUniqueEmail="false"
        passwordFormat="Hashed"
        applicationName="DotNetNuke"
        description="使用MVPHacksMembershipProvider"/>

从上面可以看出的命名空间是MyProviders，MyProviders是来自MySQLMembershipProvider.cs文件中的

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namespace MyProviders
{
///
}
namespace MyProviders
{
///
}

接着更改membership defaultProvider，如下：

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<membership defaultProvider="MySQLMembershipProvider" userIsOnlineTimeWindow="15">
<membership defaultProvider="MySQLMembershipProvider" userIsOnlineTimeWindow="15">

步骤四：
对MySQLMembershipProvider进行自定义修改。这里首先说一下，我们从前面的

public class MySQLMembershipProvider : System.Web.Security.MembershipProvider{}

就可以看出我们自定义的MySQLMembershipProvider 继承了System.Web.Security.MembershipProvider而不是System.Web.Security.SqlMembershipProvider。但是我们的代码确实SqlMembershipProvider，这样就给了我们完全的自定义空间，想想就让人兴奋。

我这次项目的目标是将已有项目的加密方式改成16位的MD5加密方式，一次我在MySQLMembershipProvider类里面添加了一个求md5的方法，代码如下：

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//注：自加求md5密码的静态方法
public static string GetMd5(string str)//求MD5
{
    return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8,16);
}
        //注：自加求md5密码的静态方法
        public static string GetMd5(string str)//求MD5
        {
            return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8,16);
        }

我们知道md5加密时单向的，这和SqlMembershipProvider中的Hashed加密方式类似，所以我想到的是直接将Hashed改写为md5类型，这样其他原封不动，修改工作量大大减少。

下面来讨论加密方式，我们在源代码中可以找到

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string salt = GenerateSalt();
        string pass = EncodePassword(password, (int)_PasswordFormat, salt);
    string salt = GenerateSalt();
            string pass = EncodePassword(password, (int)_PasswordFormat, salt);

这表明加密方式是由EncodePassword(string pass, int passwordFormat, string salt)方法来控制的，下面是我修改后的代码

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internal string EncodePassword(string pass, int passwordFormat, string salt)
{
     if (passwordFormat == 0) // MembershipPasswordFormat.Clear
         return pass;

     byte[] bIn = Encoding.Unicode.GetBytes(pass);
     byte[] bSalt = Convert.FromBase64String(salt);
     byte[] bAll = new byte[bSalt.Length + bIn.Length];
     byte[] bRet = null;

     Buffer.BlockCopy(bSalt, 0, bAll, 0, bSalt.Length);
     Buffer.BlockCopy(bIn, 0, bAll, bSalt.Length, bIn.Length);
     if (passwordFormat == 1)
     { // MembershipPasswordFormat.Hashed
         HashAlgorithm s = HashAlgorithm.Create( Membership.HashAlgorithmType );
         bRet = s.ComputeHash(bAll);
         //手动添加
         return GetMd5(pass);
     } else
     {
         bRet = EncryptPassword( bAll );
     }

     return Convert.ToBase64String(bRet);
}
       internal string EncodePassword(string pass, int passwordFormat, string salt)
        {
            if (passwordFormat == 0) // MembershipPasswordFormat.Clear
                return pass;

            byte[] bIn = Encoding.Unicode.GetBytes(pass);
            byte[] bSalt = Convert.FromBase64String(salt);
            byte[] bAll = new byte[bSalt.Length + bIn.Length];
            byte[] bRet = null;

            Buffer.BlockCopy(bSalt, 0, bAll, 0, bSalt.Length);
            Buffer.BlockCopy(bIn, 0, bAll, bSalt.Length, bIn.Length);
            if (passwordFormat == 1)
            { // MembershipPasswordFormat.Hashed
                HashAlgorithm s = HashAlgorithm.Create( Membership.HashAlgorithmType );
                bRet = s.ComputeHash(bAll);
                //手动添加
                return GetMd5(pass);
            } else
            {
                bRet = EncryptPassword( bAll );
            }

return Convert.ToBase64String(bRet);
}

这样只要我们在配置web.config的时候使用Hashed加密方式，得到的就是MD5的密码。

步骤五
下面我们要做的就是如何修改系统中原有账户的密码。

首先我们在DNN中注册一个用户，假设我们注册账号和密码都是testmd5，那么这个时候我们去数据库中查看会发现有一个密码为

"3a25306bb46a03d6"的账户，这个就是我们新建的testmd5密码的16位md5密码。

我们通过下面的脚本来更改host的密码，让其密码也成为testmd5.view plaincopy to clipboardprint?
/*
-- Database Utility ---------------------------------------------------------------------------
Description : Reset a Password in a DotNetNuke database
Author : Tony Tullemans
Date Created : 18.04.2007
Note/s : Before you run this script you must know the UserName and Password of another
registered DNN user in the database you wish to affect.
-----------------------------------------------------------------------------------------------
*/

DECLARE @databaseName VARCHAR(128)
SELECT @databaseName = DB_NAME()

PRINT 'RESET PASSWORD IN DATABASE : ' + @databaseName
PRINT '-----------------------------' + REPLICATE('-', DATALENGTH(@databaseName ));

DECLARE @knownUserName NVARCHAR(128)
DECLARE @lostUserName NVARCHAR(128)
DECLARE @lostUserId NVARCHAR(128)
DECLARE @knownPassword NVARCHAR(128)
DECLARE @knownSalt NVARCHAR(128)

SET @knownUserName = 'host'
SET @lostUserName = 'testmd5'

SELECT @knownPassword = Password, @knownSalt = PasswordSalt
FROM aspnet_Membership
INNER JOIN aspnet_users
ON aspnet_Membership.UserId = aspnet_users.UserId
where UserName = @knownUserName;

PRINT ''
PRINT 'Known Password for "' + @knownUserName + '" is : ' + @knownPassword
PRINT 'Known Password Salt for "' + @knownUserName + '" is : ' + @knownSalt

SELECT @lostUserId = aspnet_Membership.UserId
FROM aspnet_Membership
INNER JOIN aspnet_users
ON aspnet_Membership.UserId = aspnet_users.UserId
WHERE UserName = @lostUserName;

PRINT ''
PRINT 'UserID for "' + @lostUserName + '" is : ' + @lostUserId
PRINT ''

IF (DATALENGTH(@lostUserName) <= 0 OR @lostUserName IS NULL)
PRINT 'Invalid Lost User Name ' + @lostUserName
ELSE BEGIN
IF (DATALENGTH(@knownUserName) <= 0 OR @knownUserName IS NULL)
PRINT 'Invalid Lost User Name ' + @lostUserName
ELSE BEGIN
IF (DATALENGTH(@knownPassword) <= 0 OR @knownPassword IS NULL)
PRINT 'Invalid Known Password ' + @knownPassword
ELSE BEGIN
IF (DATALENGTH(@knownSalt) <= 0 OR @knownSalt IS NULL)
PRINT 'Invalid Known Salt ' + @knownSalt
ELSE BEGIN
PRINT ''
PRINT 'BEFORE'
SELECT left(UserName, 12) as UserName, aspnet_Membership.UserId, left(Email, 20) as Email, Password, PasswordSalt
FROM aspnet_Membership INNER JOIN aspnet_users ON aspnet_Membership.UserId = aspnet_users.UserId
WHERE UserName IN ( @knownUserName, @lostUserName );
PRINT ''
PRINT 'Changing Password for User Id : "' + @lostUserId + '" to "' + @knownPassword + '"'
PRINT ''
UPDATE aspnet_Membership
SET Password = @knownPassword,
PasswordSalt = @knownSalt
-- SELECT UserId, Password, PasswordSalt
-- FROM aspnet_Membership
WHERE UserId = @lostUserId;
PRINT ''
PRINT 'AFTER'
SELECT left(UserName, 12) as UserName, aspnet_Membership.UserId, left(Email, 20) as Email, Password, PasswordSalt
FROM aspnet_Membership INNER JOIN aspnet_users ON aspnet_Membership.UserId = aspnet_users.UserId
WHERE UserName IN ( @knownUserName, @lostUserName );
END
END
END
END
GO

PRINT ''
PRINT ' * * * END OF SCRIPT * * *'
PRINT ''
GO
/*
-- Database Utility ---------------------------------------------------------------------------
Description : Reset a Password in a DotNetNuke database
Author : Tony Tullemans
Date Created : 18.04.2007
Note/s : Before you run this script you must know the UserName and Password of another
registered DNN user in the database you wish to affect.
-----------------------------------------------------------------------------------------------
*/

DECLARE @databaseName VARCHAR(128)
SELECT @databaseName = DB_NAME()

PRINT 'RESET PASSWORD IN DATABASE : ' + @databaseName
PRINT '-----------------------------' + REPLICATE('-', DATALENGTH(@databaseName ));

DECLARE @knownUserName NVARCHAR(128)
DECLARE @lostUserName NVARCHAR(128)
DECLARE @lostUserId NVARCHAR(128)
DECLARE @knownPassword NVARCHAR(128)
DECLARE @knownSalt NVARCHAR(128)

SET @knownUserName = 'host'
SET @lostUserName = 'testmd5'

SELECT @knownPassword = Password, @knownSalt = PasswordSalt
FROM aspnet_Membership
INNER JOIN aspnet_users
ON aspnet_Membership.UserId = aspnet_users.UserId
where UserName = @knownUserName;

PRINT ''
PRINT 'Known Password for "' + @knownUserName + '" is : ' + @knownPassword
PRINT 'Known Password Salt for "' + @knownUserName + '" is : ' + @knownSalt

SELECT @lostUserId = aspnet_Membership.UserId
FROM aspnet_Membership
INNER JOIN aspnet_users
ON aspnet_Membership.UserId = aspnet_users.UserId
WHERE UserName = @lostUserName;

PRINT ''
PRINT 'UserID for "' + @lostUserName + '" is : ' + @lostUserId
PRINT ''

IF (DATALENGTH(@lostUserName) <= 0 OR @lostUserName IS NULL)
PRINT 'Invalid Lost User Name ' + @lostUserName
ELSE BEGIN
IF (DATALENGTH(@knownUserName) <= 0 OR @knownUserName IS NULL)
PRINT 'Invalid Lost User Name ' + @lostUserName
ELSE BEGIN
IF (DATALENGTH(@knownPassword) <= 0 OR @knownPassword IS NULL)
PRINT 'Invalid Known Password ' + @knownPassword
ELSE BEGIN
IF (DATALENGTH(@knownSalt) <= 0 OR @knownSalt IS NULL)
PRINT 'Invalid Known Salt ' + @knownSalt
ELSE BEGIN
PRINT ''
PRINT 'BEFORE'
SELECT left(UserName, 12) as UserName, aspnet_Membership.UserId, left(Email, 20) as Email, Password, PasswordSalt
FROM aspnet_Membership INNER JOIN aspnet_users ON aspnet_Membership.UserId = aspnet_users.UserId
WHERE UserName IN ( @knownUserName, @lostUserName );
PRINT ''
PRINT 'Changing Password for User Id : "' + @lostUserId + '" to "' + @knownPassword + '"'
PRINT ''
UPDATE aspnet_Membership
SET Password = @knownPassword,
PasswordSalt = @knownSalt
-- SELECT UserId, Password, PasswordSalt
-- FROM aspnet_Membership
WHERE UserId = @lostUserId;
PRINT ''
PRINT 'AFTER'
SELECT left(UserName, 12) as UserName, aspnet_Membership.UserId, left(Email, 20) as Email, Password, PasswordSalt
FROM aspnet_Membership INNER JOIN aspnet_users ON aspnet_Membership.UserId = aspnet_users.UserId
WHERE UserName IN ( @knownUserName, @lostUserName );
END
END
END
END
GO